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The Doctor and Adric learn from the wizened Keeper of Traken that a great evil has come to his planet in the form of a Melkur - a calcified statue. The Keeper of Traken is nearing the end of his reign and seeks the Doctor's help in preventing the evil from taking control of the bioelectronic source that is the keystone of the Traken Union's civilisation.
as The Doctor
as Adric
as Nyssa
as Melkur / The Master
as Tremas / The Master
as Kassia
as The Keeper
as Seron
as Katura
as Luvic
as Neman
as Foster
as Foster
